Submission #1109050

#	Time	Username	Problem	Language	Result	Execution time	Memory
1109050		codexistent	Dango Maker (JOI18_dango_maker)	C++14	100 / 100	410 ms	203488 KiB

dango_maker

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define MAXNM 3005
#define FOR(i, a, b) for(ll i = a; i <= b; i++)

ll n, m, r = 0, dp[MAXNM * 2][3];
char g[MAXNM][MAXNM];
bool ok[MAXNM][MAXNM][2];
vector<array<ll, 2>> e[MAXNM * 2];

int main(){
    cin >> n >> m;
    FOR(i, 1, n){
        string s; cin >> s;
        FOR(j, 1, m) g[i][j] = s[j - 1];
    } 

    FOR(i, 1, n){
        FOR(j, 1, m){
            ok[i][j][0] = (g[i][j - 1] == 'R' && g[i][j] == 'G' && g[i][j + 1] == 'W');
            ok[i][j][1] = (g[i - 1][j] == 'R' && g[i][j] == 'G' && g[i + 1][j] == 'W');

            e[i + j].push_back({i, j});
        }
    }

    FOR(i, 1, n + m){
        ll f = (ll)e[i].size() - 1;
        if(e[i].empty()) continue;

        dp[0][0] = ok[e[i][0][0]][e[i][0][1]][0];
        dp[0][1] = ok[e[i][0][0]][e[i][0][1]][1];
        dp[0][2] = 0;
        FOR(j, 1, f){
            ll x = e[i][j][0], y = e[i][j][1];
            dp[j][2] = max({dp[j - 1][0], dp[j - 1][1], dp[j - 1][2]});
            dp[j][0] = max(dp[j - 1][0], dp[j - 1][2]) + ok[x][y][0];
            dp[j][1] = max(dp[j - 1][1], dp[j - 1][2]) + ok[x][y][1];
        }

        r += max({dp[f][0], dp[f][1], dp[f][2]});
    }

    cout << r << endl;
}

• Subtask 1: 13 / 13
• Subtask 2: 20 / 20
• Subtask 3: 67 / 67